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A119127
Numbers k such that the k-th triangular number contains only digits {1,4,7}.
2
1, 18, 38, 58, 15306, 28893, 3851686, 595216169886, 53248694146381, 536869582203620058, 14927275335718688666
OFFSET
1,2
CROSSREFS
Cf. A000217, A079654. See A119034 for a table of cross-references.
Sequence in context: A041646 A244412 A114698 * A190739 A084585 A132761
KEYWORD
nonn,base,more
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(10)-a(11) from Tyler Busby, Mar 31 2023
STATUS
approved